318 Mr. J. W. Mallet on Breivsterite. 



in addition to the former piece, could only procure from Von 

 Struve about i| oz. weight, consisting of a large fragment and 

 three small chips ; and it was only in 1845 that he succeeded 

 in purchasing, of Di*. Ferdinand Krauss of Stuttgart, a larger, 

 nearly complete stone, with external crust and weighing about 

 12j^ oz., which the latter gentleman had brought from the 

 Cape ; and it was Sir J. llerschel himself who in the year 1847 

 made the Royal Mineralogical Cabinet the valuable present of 

 a fragment of the stone with fresh surfaces and external crust, 

 weighing G^ oz., as well as two smaller pieces which together 

 weighed \ of an ounce. One of the first pieces received from 

 Von Struve, Director Homes gave M. "VVohler for analysis. 



So few pieces of the Cape meteorite have, in truth, come within 

 reach of a chemical examination like the latest of Wohler's 

 (prompted by the fact of the discovery in meteorites of a bitumi- 

 nous substance formed according to the laws of organic mattei'), 

 that, after the facts here communicated, we need not despair of 

 obtaining somewhat larger quantities of the material in question, 

 so as to make the new substance itself the subject of further in- 

 vestigation. 



XXXIII. On Brewsterite. By J. W. Mallet*. 



TWO analyses of the mineral species Brewsterite are on 

 record, those of Connellf and Thomson f, both made 

 many years ago. The results were, — 



Connell. Thomson. 



Silica 53-666 53-045 



Alumina .... 17-492 16540 



Baryta 6-749 6-050 



Strontia .... 8-325 9-005 



Lime 1-346 -800 



Water 12-584 14-735 



Peroxide of iron. . -292 



100-454 100-175 



It is sti-ange that in Thomson^s ' Outlines of Mineralogy, Geo- 

 logy,' &c., the analysis of Coiniell is given with altogether differ- 

 ent figures, thus : — 



* From Silliman's American Journal for July 1859, 



t Ediub. New Phil. Journ. No. 1.9. p. 35. 



X Outlines of Mineral. Geol. and Min. Anal. vol. i. j). 348. 



